wehnelt interrupter / electrolytic interrupter can work as a switching up or down converter, fully analog, no transistors, thyristors, no ic, no capacitors, jus

wehnelt interrupter / electrolytic interrupter can work as a switching up or down converter, fully analog, no transistors, thyristors, no ic, no capacitors, just coil. single electric motor can be used stationary as a transformer or in pairs, in motion like inverter, rectifier, (synchronous rotary converter) autotransformer